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John M. Lipski is Edwin Erle Sparks Professor of Spanish Linguistics in the Department of Spanish, Italian, and Portuguese and director of the Program in Linguistics at Pennsylvania State University. He received his Ph.D. from the University of Alberta, Canada. His research interests include Spanish phonology, Spanish and Portuguese dialectology and language variation, the linguistic aspects of bilingualism, and the African contribution to Spanish and Portuguese. He is the author of twelve books and more than 250 articles on all aspects of linguistics. He has served as editor of the journal Hispanic Linguistics and as associate editor of Hispania, and is currently acquisitions editor for the Spanish linguistics monograph series at Georgetown University Press. He has done fieldwork in Spain (including the Canary Islands), Africa, Brazil and all Spanish-speaking countries in Latin America, the Philippines, Guam, and many Spanish-speaking communities within the United States.